Algae. — Pflanzenkrankheiten. 105 



'■ts 



occur also in deposits that underlie the flood piain meadows along 

 the creek banks. The author found species of Gleocapsa, MicrocystiSj 

 Coelospherium, Aphanocapsa, Oscillatoria, Riviilaria, Nostoc and 

 Chvoococcus associated with the nodules. Harshberger. 



Setchell, W. A., The Marine Flora of th e Pacific Coast. 

 (Nature and Science on the Pacific Coast. p. 177—184. 1915.) 



The author of this chapter describes the zones controlled by 

 temperature and the principal algae of each zone. The algae proper 

 are dealt with as Myxophyceae, Phaeophyceae, Rhodophyceae. Finally 

 references are given. Harshberger. 



Graves, A. H., Notes on diseases of trees in the Southern 

 Appalachians. I. (Phytopathology. III p. 129—139. 1913.) 



It was the purpose of the writer in these notes, the first of a 

 series of papers, to bring together the most important data obtained 

 about several hitherto undescribed or little known diseases. In this 

 paper some diseases, of the white pine {Piniis stvohtis L.) are dis- 

 cussed: 



Bark blight, caused by Coccomyces Pini (Alb. et Schw.) Karst.; 

 the writer is inclined to the belief that it is a facultative parasite, 

 for besides its frequent occurrence in the long discolored Strips 

 surrounded by the healthy bark, it often entirely envelops the 

 smaller, terminal twigs, which are quite dead, apparently as a result 

 of its attack. On the othen band it is quite possible that its attack 

 is of a secondary nature; i.e. preceded by injur}'^ to the branches 

 from drought, cold, sun-scald etc. This auestion can only be con- 

 clusively settled by thorough inoculation experiments. 



A case of heart rot of white pine, caused by Trametes Pini 

 (Brot.) Fr. was observed as a good example of the way in which a 

 fungus causing heart rot can indirectly bring about the death of a 

 tree by weakening its mechanical support and thus render it sus- 

 ceptible to windfall. 



About leaf blight. caused by Lophodevminrn brachysponim 

 Rostrup, the writer gives as his belief, that this species is identical 

 with Hypodenna Desmasierii Duby, but a final decision of the 

 question must rest upon a careful comparison of our form with the 

 type specimens of H. Desmasierii Duby, which the writer has not 

 yet been able to obtain. 



In connection with the Lophodennium brachysporum Rostrup 

 associated with the leaf blight there comraonly occurred a form 

 which appeared to agree with the description and exsiccati of another 

 fungus: i.e. Hypoderma lineare Peck. This may, however, benothing 

 but an abnormally developed form of Lophodennium hrachysporiim. 

 The considerations, upon which the writer bases this belief, are 

 pointed out. M. J. Sirks (Haarlem). 



Melchers, L. E., A new alfalfa leaf-spot in America. 

 (Science. N. S. XLII. p. 536-537. Oct. 15. 1915.) 



An undetermined species of Pleosphoeriilina, considered as of 

 possible economic importance since like P seil dop esisa, it causes 

 destruction of the foliage. Trelease. 



